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Segments Disclosures - Additions to non-current assets (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of operating segments [line items] |  |  |
Property, plant and equipment expenditures | $ 486 | $ 417 | $ 277
Purchase of intangible assets | 14 | 14 | 20
Corporate |  |  |
Disclosure of operating segments [line items] |  |  |
Property, plant and equipment expenditures | 13 | 1 | 2
Purchase of intangible assets | 13 | 12 | 17
Operating segments | Hydro |  |  |
Disclosure of operating segments [line items] |  |  |
Property, plant and equipment expenditures | 22 | 23 | 16
Purchase of intangible assets | 0 | 0 | 0
Operating segments | Wind and Solar |  |  |
Disclosure of operating segments [line items] |  |  |
Property, plant and equipment expenditures | 174 | 229 | 117
Purchase of intangible assets | 0 | 0 | 0
Operating segments | North American Gas |  |  |
Disclosure of operating segments [line items] |  |  |
Property, plant and equipment expenditures | 39 | 36 | 21
Purchase of intangible assets | 0 | 0 | 0
Operating segments | Australian Gas |  |  |
Disclosure of operating segments [line items] |  |  |
Property, plant and equipment expenditures | 10 | 6 | 6
Purchase of intangible assets | 0 | 0 | 0
Operating segments | Alberta Thermal |  |  |
Disclosure of operating segments [line items] |  |  |
Property, plant and equipment expenditures | 200 | 114 | 101
Purchase of intangible assets | 1 | 2 | 3
Operating segments | Centralia |  |  |
Disclosure of operating segments [line items] |  |  |
Property, plant and equipment expenditures | 28 | 8 | 14
Purchase of intangible assets | 0 | 0 | 0
Operating segments | Energy Marketing |  |  |
Disclosure of operating segments [line items] |  |  |
Property, plant and equipment expenditures | 0 | 0 | 0
Purchase of intangible assets | $ 0 | $ 0 | $ 0

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